Pentax HD Pentax-DA 16-50mm f/2.8 ED PLM AW Lens #28030

Effortless manual-focus operation, with limited lens extension during focusing between the minimum focusing distance and infinity and optimum focus-ring torque Nine-blade circular diaphragm to produce a natural, beautiful bokeh (defocus) effect (from open aperture to F5.6 in the wide-angle range; from open aperture to F8 in the telephoto range), while minimizing the streaking of point light sources Quick-Shift Focus System to provide an instant shift to manual-focus operation, after locking the subject in focus during AF operation by pressing the camera's shutter-release button halfway down; this system can be used at any time during AF operation SP (Super Protect) Coating to keep the lens front surface free of dust and stains